Roller-chain



(NoMoael.)

. W. M. PATT.

ROLLER CHAIN. No. 290.798. Patented Dec. 25,1883.

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WILLIAM M. PATT, OF PLAINV ILLE, MASSACHUSETTS.

ROLLER-CHAIN.

SPECIFICATION forming part of Letters Patent No. 290,798, dated December 25, 1883.

Application led June 9, 1883.

To all whom, it may concern.-

Be it known that I, WILLIAM M. PATT, of Plainville, county of Norfolk, and State of Massachusetts, have invented a new and useful Improvement in Roller Chains; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

This invention has reference to an improve` ment in the construction of the units or collets forming the edges of roller-chains, and it consists in the peculiar and novel construct-ion by which the ordinary unit is provided with a short section of tubular wire drawn into apcculiar form to receive the staples and form the side units, as will be more full y set forth hereinafter.

Figure l is a perspective View of a rollerchain provided with my improved edge units. Fig. 2 is an enlarged view of a roller-chain, shown partly in section. Fig. 3'is a sectional View of a partly-formed end unit.

from which short sections are cut to 'serted into the end units.

In the manufacture of rollerchains the small rings, units, or collets forming the main portion of the chain are made of thin sheet metal in a machine, which first cups the same, and then closes the sheet over to form the unit. In Fig. 3 the half-formed unit is shown in solid lines and the closed unit indicated inbroken lines, and in Fig. 2 the completed units are shown in solid lines. The side units have heretofore been provided with two holes, through which the staples are passed to secure the units in forming the chain, and separate niachines were required to form these side units.

The object of this invention is to simplify be in- Fig. 4 isv `a view and section of a piecev of tubular wire (No model.)

the construction and construct all the units so that the saine may be made in the same or similar machines.

In the drawings, AAare the ordinary units forming the main portion of a roller-chain.

B B are the side units.

C C are the staples by which the units are secured together to form the chain.

D D are short pieces of tubular wire, formed, as shown in Fig. 4, by forcing two opposite sides of a cylindrical tube inward, so as to form spaces through which the staples G C can pass. These short pieces of tubular wire are placed into the partly-formed units, and are secured by closing the unit in the usual niauner, as is shown in`Fig. 3, and when the chain is united the ends of the staples C C are bent over the sections D of tubular wire, as is shown in Fig. 2. The sections of tubular wire D strengthen the side units,as they sustain the metal ot' the same against external pressure. They give a firm and solid bearing to the turnedin ends of the staples,niaking a strong and durable fastening.

Having thus described my inventiomIclaim as new and desire to secure by Letters Patent- 1. The combination, with the unit or collet of a roller-chain, ofthe section of tubular wire D, inclosed in the unit and constructed to receive the ends of the staples, as described.

2. The combination, with the units A A and the units B B, of the staples C C and the sections of tubular wire D, constructed to allovsT the staples to pass on the outer side and clinch on the inner side of thesame to form a rollerchain, as described.

WILLIAM M. PATT.

Witnesses:

J. A. MILLER, Jr., M. F. BLIe-H. 

